The WMI ports are set to their own extensions, and are not in the same range as the phones (24xx for phones, 29xx for voicemail ports and MWI ports).
I did find two subscribers (using the dump tool) that had wierd mwi settings...two entries, one of them blank. I deleted both and re-created the one they should have (just an X in it - all the others are like that).
I would also look at your CallManager trace information and if you want a more detailed look at the code running in each voicemail port, run Unity Port Status Monitor from Unity Tools Depot. You mentioned it was from a random voicemail port, does that mean its always the same port or changes port number? In the Unity port configuration of the SA, look to see which ports you have configured for MWI, Notification, and TraP. One last thing, it's a stretch ... are you running the current version of ViewMail 4.2 or not using ViewMail? There was a previous bug in ViewMail 4.0(4) where TRaP calls would ring the phone once and then hang up due to a bug.
Could also be folks hitting your "press 0 to transfer to an operator" but then hanging up before the transfer completes. You might be able to narrow it down some just by keeping tabs on which random ports the calls come from. Lower numbered ports would typcially be handling callers and attempting transfers. Higher numbered ports would be trying to do MWI or Notifications. Of course the detailed traces from CCM or Unity would really give you the answer if you can find your way through them.
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